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Process of recovering epoxy chloropropane from effluent

A technology for epichlorohydrin and waste water, applied in heating water/sewage treatment, organic chemistry, etc., can solve the problems of large equipment, difficult operation, and low purity of recycled epichlorohydrin, so as to reduce cost and difficulty, and reduce consumption Effect

Active Publication Date: 2010-05-12
NANTONG XINGCHEN SYNTHETIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: to overcome the shortcomings of the existing recovery process such as complex process, difficult operation, huge equipment, and low purity of recovered epichlorohydrin, and to provide a method for recovering epichlorohydrin from waste water containing epichlorohydrin A new method to effectively recover the raw material epichlorohydrin contained in wastewater, reducing the cost and difficulty of wastewater treatment

Method used

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  • Process of recovering epoxy chloropropane from effluent
  • Process of recovering epoxy chloropropane from effluent
  • Process of recovering epoxy chloropropane from effluent

Examples

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Effect test

Embodiment 1

[0016] Content is about 6.58% (wt%) saturated epichlorohydrin waste water from epichlorohydrin waste water storage tank 1 by discharge pump 2, enters rectification tower 4 rectification through heat exchanger 3, feeds in the tower, The flow rate is 100kg / h; the temperature at the bottom of the kettle is controlled at 95-99°C, and the temperature at the top of the tower is controlled at 87-90°C; the flow rate at the bottom of the tower is 94kg / h, and the azeotrope is discharged from the top of the tower at a flow rate of 8.3kg / h Condensate through condenser 5, collect and stand in phase separator 6, after stratification, the upper layer liquid flows back into the tower from the tower, the flow rate is 2.3kg / h, and the lower layer liquid flow rate is 6kg / h, collected in epichlorohydrin In storage tank 7, every hundred kilograms of epichlorohydrin waste water recyclable epichlorohydrin is 5.2 kilograms, and promptly epichlorohydrin yield is 5.6% (mass percentage), reclaims the con...

Embodiment 2

[0018] The saturated epichlorohydrin waste water with a content of about 6.58% passes through the discharge pump 2, and enters the rectification tower 4 through the heat exchanger 3 for rectification, and feeds in the tower; Control at 91-95°C; the azeotrope is discharged from the top of the tower through the condenser 5, collected in the phase separator 6 and left to stand, after layering, the upper layer is refluxed, the tower is fed, and the lower layer liquid is collected in the epichlorohydrin storage In the tank 7, the yield of epichlorohydrin is 5.9% (mass percentage), the content of recovered epichlorohydrin is 97.2%, and the recovery rate is 89.7%.

Embodiment 3

[0020] 5.5% epichlorohydrin waste water passes through the discharge pump 2, enters the rectification tower 4 through the heat exchanger 3 for rectification, and feeds in the tower; the temperature at the bottom of the kettle is controlled at 95-99 °C, and the temperature at the top of the tower is controlled at 87-90 °C ℃; the azeotrope is discharged from the top of the tower through the condenser 5, collected and left in the phase separator 6, and the upper layer is refluxed after layering, and the tower is fed, and the lower liquid is collected in the epichlorohydrin storage tank 7, and the ring The yield of oxychloropropane was 4.7% (mass percentage).

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Abstract

The process of recovering epoxy chloropropane from effluent features that effluent containing epoxy chloropropane is pumped with material pump from the storage tank through the heat exchanger to the rectifying tower for rectifying at the tower temperature controlled at 95-102 deg.c and tower top temperature controlled at 87-95 deg.c, and the azeotrope of epoxy chloropropane and water flowing out through the tower top is condensed in the condenser and delaminated in the phase separator, with the upper layer of liquid being reflowed into the tower and the lower layer of liquid being collected inthe epoxy chloropropane storing tank. The said process has epoxy chloropropane recovering rate of 70-90 % and epoxy chloropropane content in the recovered product up to 95-98 %, lowers the epoxy chloropropane consumption in epoxy resin production and facilitates effluent treatment.

Description

1. Technical field [0001] The invention relates to a waste water treatment process, in particular to a process for recovering epichlorohydrin from waste water containing epichlorohydrin in an epoxy resin production process. 2. Background technology [0002] In the production process of epoxy resin, there will be process wastewater containing epichlorohydrin, and its content is 6.58% in the saturated epichlorohydrin wastewater at normal temperature. And concentration is that the COD of the epichlorohydrin waste water of 6.58% is as high as 110,000, if directly sent to sewage treatment station for treatment, treatment cost and difficulty are all very high. At present, the method for recovering epichlorohydrin from the process wastewater is to first add water to the waste liquid, and through rectification under reduced pressure, the lower layer distillate is simply distilled, and the epichlorohydrin is separated by rectification at 117 ° C, so that The recycling process is com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D301/32C07D303/08C02F1/04
Inventor 冯雪峰朱菊芬章全民吴俊周雁新
Owner NANTONG XINGCHEN SYNTHETIC MATERIAL